<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">You can install multiple versions of ghc with the haskell platform — just procure the one for the appropriate version of GHC and install it. Swapping between versions can be done with the activate-hs script that is installed for you.</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">That said, there is also a ghc-8.0 branch of ghcjs that should work with 8.0.1</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">-g</div> <br><p class="airmail_on">On April 5, 2018 at 2:08:22 PM, Dennis Raddle (<a href="mailto:dennis.raddle@gmail.com">dennis.raddle@gmail.com</a>) wrote:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
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<div dir="ltr">I'm on a MacBook Pro. I'm not very familiar with
software installation.
<div><br></div>
<div>Up until now I've been using Stack for GHC work, and it seems
to take care of having the right version of GHC.</div>
<div><br></div>
<div>Now I'm going to use GHCJS, and I need to have a system GHC
installed (I believe). At some point in the past I installed the
Haskell Platform for Mac, and I have GHC 8.01. But I want to
downgrade that to 7.10 so that I don't have to worry about
compatibility with GHCJS. </div>
<div><br></div>
<div>How do I go about uninstalling GHC 8 and installing 7.10 in
its place? Can I use Homebrew?</div>
<div><br></div>
<div>D</div>
</div>
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